Vibrating mechanism of a body vibration machine

ABSTRACT

A vibrating mechanism of a body vibration machine includes a step, a bottom board and a driving mechanism that has upper linking bars and lower linking bars connected with the step and the bottom board, and plural direction-restricting sets installed between the step and the bottom board. Each position-restricting set has a cylinder and a guiding bar inserted in the cylinder to enable the step moved vertically. A crank is connected with the upper linking bar and the lower linking bar via a pivotal shaft so that it can spontaneously drive the pivotal shaft to move circularly, enabling the step to move vertically. Moreover, a small motor is powerful enough as the step is driven to move by the upper and the lower linking bar instead of the driving motor directly.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a vibrating mechanism of a body vibrationmachine, particularly to one that demands only a relatively smalldriving motor to move its step vertically in a stable amplitude ofvibration.

2. Description of the Prior Art

Commonly, there are various sorts of conventional body vibrationmachines. As shown in FIGS. 1˜3, a first conventional body vibrationmachine includes a vibrating motor 10 able to work eccentrically, and aconnecting body 11 positioned on the top of the vibrating motor 10 forfixing with the bottom of a step 12 to keep the vibrating motor 10 hungin the air. In addition, there are plural pairs of direction-restrictingposts 13 positioned correspondingly on two lateral sides of a bottombase 14, used to support the step 12. Because the step 12 is supportedby the direction-restricting posts 13, the M (the amplitude of vibrationof the step 12) is directly proportional to the ΣF (resultant force),wherein ΣF=F (centrifugal force)−L (load). That is, when the L (theweight of a man standing on the step 12) is increased, the ΣF is tobecome smaller, obtaining a relatively smaller M. On the contrary, alarger M is to be attained if the step 12 is loaded with a lighterperson. Therefore, the M is to alter in accordance with the weight ofthe person standing on the step 12, becoming unsteady. Moreover, as thevibrating motor 10 is fixed with the step 12 to work eccentrically andthe step 12 is supported by the direction-restricting rods 13, the step12 is to be vibrated in X-, Y- and Z-direction, unable to move just upand down.

Additionally, as shown in FIG. 4(A,B,C,D), a second conventional bodyvibration machine is provided with a driving motor 20, a rotator 21fixed on a spindle 200 of the driving motor 20, a crank 22 pivotallyconnected at an eccentric position 211 of the rotator 21, and a step 23having its bottom side pivotally fixed with the other end of the crank22. There are also plural pairs of tubular posts 24 positionedcorrespondingly at two sides of the driving motor 20 and each tubularpost 24 is installed with a guiding bar 26 inside it. The tubular post24 and the driving motor 20 are all fixed on a bottom base 25. Theguiding bars 26 are fixed together with the step 23 at their top ends.In using, when the driving motor 20 is turned on, the rotator 21 isdriven to rotate, and the crank 22 is thus driven by the rotator 21 torotate spontaneously, enabling the step 23 to move and vibrate just upand down as the guiding bars 26 are restricted to move inside thetubular posts 24. And, because the crank 22 is connected with the step23 by its one end and with the rotator 21 by the other end, the step 23is able to maintain stable vibration without being affected by a body'sweight, overcoming the defect of the first conventional body vibrationmachine. But, in order to directly drive the step 23 to move up anddown, the driving motor 20 needs to be more powerful to do the job,resulting in a high cost.

SUMMARY OF THE INVENTION

The objective of this invention is to offer a vibrating mechanism of abody vibration machine, which can move a step vertically in a steadyamplitude of vibration and does not need a large powerful driving motorso as to save cost.

The main characteristics of the invention are a step, a bottom board anda driving mechanism. The driving mechanism is provided with two upperlinking bars and two lower linking bars connected respectively with thestep and the bottom board, and plural direction-restricting setscorrespondingly installed between the step and the bottom board. Each ofthe direction-restricting sets has a cylinder fixed on the bottom boardand a guiding bar inserted in the cylinder and connected with a bottomof the step to enable the step moved merely up and down. A crank ispivotally connected together with the upper linking bar and the lowerlinking bar by means of a pivotal shaft, so that the crank canspontaneously drive the pivotal shaft to move circularly to enable thestep to move just up and down. And, instead of being driven by thedriving motor directly, the step is driven by the upper linking bar andthe lower linking bar to move up and down, able to save cost by using asmaller driving motor.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanyingdrawings, wherein:

FIG. 1 is an exploded perspective view of a body vibration machine witha first conventional vibrating mechanism;

FIG. 2 is a side view of the body vibration machine with the firstconventional vibrating mechanism, showing it not being pressed down;

FIG. 3 is a side view of the body vibration machine with the firstconventional vibrating mechanism, showing it being pressed down;

FIG. 4(A,B,C,D) is a side view of a body vibration machine with a secondconventional vibrating mechanism, showing it being pressed down and howit functions;

FIG. 5 is a perspective view of a preferred embodiment of a vibratingmechanism of a body vibration machine in the present invention;

FIG. 6 is an exploded perspective view of the preferred embodiment of avibrating mechanism of a body vibration machine in the presentinvention;

FIG. 7 is a top view of the preferred embodiment of a vibratingmechanism of a body vibration machine in the present invention;

FIG. 8 is a side view of the preferred embodiment of a vibratingmechanism of a body vibration machine in the present invention, showinga step is moved to a highest level;

FIG. 9 is a side view of the preferred embodiment of a vibratingmechanism of a body vibration machine in the present invention, showingthe step is moved to a lowest level; and

FIG. 10(A,B,C,D) is a side view of the preferred embodiment of avibrating mechanism of a body vibration machine in the presentinvention, showing how it works.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIGS. 5˜9, a preferred embodiment of a vibrating mechanismof a body vibration machine in the present invention includes a step80A, a bottom board 80B and a driving mechanism. The driving mechanismis composed of a driving motor 30, a small pulley 40 fixed on a spindleof the driving motor 30, a larger pulley 50 linked with the small pulley40 via a belt 41, two upper linking bars 70A connected with the step 80Aand two lower linking bars 70B connected with the bottom board 80B. Thelarge pulley 50 is provided with an axial shaft 51 that is connectedpivotally with an eccentric rod 52 at its two ends respectively. Eacheccentric rod 52 is connected pivotally with a crank 60 by its otherend. The crank 60 is provided with a pivotal shaft 61 located at theother end for connecting pivotally with an upper linking bar 70A and alower linking bar 70B, so that the crank 60 can drive the pivotal shaft61 to rotate circularly to drag the upper linking bar 70A and the lowerlinking bar 70B, as shown in FIGS. 8, 9 and 10. There are fourdirection-restricting sets 90 positioned at four corners of the bottomboard 80B for elastically supporting the step 80A. And, as shown inFIGS. 6 and 8, each of the direction-restricting sets 90 is providedwith a cylinder 91 fixed on the bottom board 80B, a bush 92 fixed on thetop of the cylinder 90, a positioning disc 93 fixed on the bottom of thestep 80A to face exactly to a cylinder body 91. The positioning disc 93is provided with a female-threaded hole for screwing with amale-threaded portion located at a top end of a guiding bar 94 that isto be inserted into the cylinder body 91 through the bush 92, in orderto restrict the step 80A moving just up and down without swinging. Inaddition, a spring 95 is installed between the bush 92 and thepositioning disc 93 for elastically supporting the step 80A.

In using, as shown in FIG. 10, when the driving motor 30 is turned on,the eccentric rod 52 is to be driven by the shaft 51 of the large pulley50 to do a circular motion. The crank 60 is then spontaneously driven toenable the pivotal shaft 61 to move circularly, keeping the upperlinking bar 70A and the lower linking bar 70B dragged to move. And,because the step 80A is directly connected with and limited by the upperlinking bar 70A and the lower linking bar 70B and the guiding bar 94 ofthe direction-restricting set 90 is inserted inside the cylinder body 91and the bush 92, it can only move up and down in a steady amplitude ofvibration. Also, instead of being driven by the driving motor 30directly, the step 80A is dragged to move via the upper linking bar 70Aand the lower linking bar 70B that are connected pivotally together withthe crank 60 by means of the pivotal shaft 61. So, the driving motor 30does not need too much power to do the job, with its cost possible to bereduced considerably.

While the preferred embodiment of the invention has been describedabove, it will be recognized and understood that various modificationsmay be made therein and the appended claims are intended to cover allsuch modifications that may fall within the spirit and scope of theinvention.

1. A vibrating mechanism of a body vibration machine, said mechanismcomprising a bottom board, a step and a driving mechanism fixed on saidbottom board to enable said step vibrated, said driving mechanismcomprising: two upper linking bars connected with said step; two lowerlinking bars connected with said bottom board; pluraldirection-restricting sets correspondingly installed between said stepand said bottom board, each said direction-restricting set consisting ofa hollow cylinder fixed on said bottom board and a guiding bar insertedin said cylinder and connected with a bottom of said step to enable saidstep moved vertically; and, a driving motor for eccentrically driving acrank that has a pivotal shaft at its other end to pivotally connectedtogether with said upper linking bar and said lower linking bar, saidcrank able to drive said pivotal shaft and said upper linking bar andsaid lower linking bar to spontaneously move circularly while driveneccentrically by said driving motor, said step thus only possible tomove vertically because of said direction-restricting sets.
 2. Avibrating mechanism of a body vibration machine as claimed in claim 1,wherein said crank is pivotally connected with one end of an eccentricrod of a large pulley that is driven by a belt connected to a smallpulley driven by said driving motor.
 3. A vibrating mechanism of a bodyvibration machine as claimed in claim 1, wherein each saiddirection-restricting set is provided with a bush fixed on the top ofsaid cylinder, a positioning disc fixed on a bottom of said step andscrewed together with a top portion of said guiding bar, and a springinstalled between said positioning disc and said bush to mount aroundsaid guiding bar.